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Rational expresions and equations: Ratio and Proportions Options
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tcursive
#1 Posted : Saturday, January 28, 2012 2:04:07 AM
Rank: Newbie

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Joined: 1/28/2012
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I am trying to help someone solve the following problem: It takes a teacher 45 minutes to grade a set of quizzes and takes her aide twice as long to do the same amount of grading. How long will it take them to grade a set of quizzes if they work together?
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